Patents by Inventor Brian Ernest Leggeter

Brian Ernest Leggeter has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Styryl-tetrahydronaphthyl derivatives
    Patent number: 4093645
    Abstract: Compounds of the general formula R--CH.dbd.CH--W--CH.dbd.CH--R.sup.1 are described in which R and R.sup.1 are independently phenyl, diphenyl, naphthyl, indyl, tetrahydronaphthyl or acenaphthenyl and W is divalent phenyl, diphenyl, naphthyl, tetrahydronaphthyl or acenaphthenyl group, which groups may be substituted, the compounds containing at least one non-aromatic ring. Such compounds are useful as optical whitening agents, for example in textile material or paper.
    Type: Grant
    Filed: November 28, 1975
    Date of Patent: June 6, 1978
    Assignee: Hickson & Welch Limited
    Inventors: Hugh Davidson, Keith Trevor Johnson, Brian Ernest Leggeter, Anthony John Moore
  • Styryl-diphenyl derivatives
    Patent number: 3940437
    Abstract: Compounds of the general formula R-CH=CH-W-CH=CH-R.sup.1 are described in which R and R.sup.1 are independently phenyl, diphenyl, naphthyl, indyl, tetrahydronaphthyl or acenaphthenyl and W is divalent phenyl, diphenyl, naphthyl, tetrahydronaphthyl or acenaphthenyl group, which groups may be substituted, the compounds containing at least one non-aromatic ring. Such compounds are useful as optical whitening agents, for example in textile material or paper.
    Type: Grant
    Filed: July 24, 1973
    Date of Patent: February 24, 1976
    Assignee: Hickson & Welch Limited
    Inventors: Hugh Davidson, Keith Trevor Johnson, Brian Ernest Leggeter, Anthony John Moore
  • 3-Oxadiazolyl coumarins
    Patent number: 3933842
    Abstract: Substituted coumarins are described having at the 7-position the group RO- where R is a substituted or unsubstituted alkyl, cycloalkyl or aralkyl group, and at the 3-position a 1,2,4- or 1,3,4-oxadiazolyl group which possesses a substituted or unsubstituted alkyl or aryl substituent. The compounds are useful as optical whitening agents in the treatment of textile fibres.
    Type: Grant
    Filed: September 5, 1973
    Date of Patent: January 20, 1976
    Assignee: Hickson & Welch Limited
    Inventors: Hugh Davidson, Keith Trevor Johnson, Brian Ernest Leggeter, Anthony John Moore